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Dose-response-relationship between number of laser burns and IOP reduction in cyclophotocoagulation: an animal study
Lars Wagenfeld1, Hendrik Schwarzer2, Gernot Roessler3
1Department of Ophthalmology, University Medical-Center Hamburg-Eppendorf, 20246 Hamburg, Germany.
Purpose:
The relationship between number of laser burns of cyclophotocoagulation (CPC) and intraocular pressure (IOP) reduction is unknown. This animal model was established to reveal a possible dose-response-relationship between the number of applied laser burns and the IOP lowering effect.
Methods:
30 chinchilla bastard rabbits were divided into 5 groups and treated with either 1, 5, 10, 20, or 30 CPC burns, respectively. IOP was followed up for 1 week. IOP reduction of a single 30-burn treatment was compared with a fractionated treatment (three sessions; one week in between; 10 burns/session).
Results:
IOP reduction increases nonlinearly with the number of CPC burns (max. -6.1 ± 1.4 mmHg). Fractionated treatment shows similar IOP reduction with less complications and more constant results compared to single session treatment.
Conclusions:
The study reveals a complex relationship between IOP reduction and the number of CPC burns. Fractionated CPC gives comparable IOP reduction at a higher degree of safety.
